From the Classical Arabic root ق-ل-ب (q-l-b), conveying the idea of "turning" or "flipping." The heart was conceived as the organ that constantly turns — both physically (beating) and metaphorically (changing, feeling). This root also gives Arabic قَلَبَ (qalaba, "to turn over/flip") and انْقِلَاب (inqilāb, "revolution/coup"), literally a "turning upside-down."

In Arab culture and classical Arabic poetry, the قَلْب is far more than a physical organ — it is the seat of intellect, will, and emotion, much as the ancient Greeks assigned those roles to the liver or mind. The phrase "من القلب" (min al-qalb, "from the heart") is a common intensifier in everyday speech, equivalent to "sincerely" or "wholeheartedly." False-friend note: do not confuse قَلْب with the verb قَلَبَ (to flip/overturn), though they share the same root.